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/* mk_preauth.c */
/* part of Cygnus Network Security */
/* Copyright 1994 Cygnus Support */
/*
* Permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation.
* Cygnus Support makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "krb.h"
#include <string.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern char *malloc(), *calloc(), *realloc();
#endif
int
krb_mk_preauth(preauth_p, preauth_len,
key_proc,aname,inst,realm,password,key)
char **preauth_p;
int *preauth_len;
key_proc_type key_proc;
char *aname;
char *inst;
char *realm;
char *password;
C_Block key;
{
#ifdef NOENCRYPTION
*preauth_len = strlen(aname)+1; /* include the trailing 0 */
*preauth_p = malloc(*preauth_len);
strcpy(*preauth_p, aname); /* this will copy the trailing 0 */
#else
des_key_schedule key_s;
int sl = strlen(aname);
#endif
(*key_proc)(aname,inst,realm,password,key);
#ifndef NOENCRYPTION
/*
* preauth_len is set to a length greater than sl + 1
* and a multpile of 8
*/
*preauth_len = (((sl + 1) / 8) + 1) * 8;
/* allocate memory for preauth_p and fill it with 0 */
*preauth_p = (char*) malloc(*preauth_len);
/* create the key schedule */
if (des_key_sched(key, key_s)) {
return 1;
}
/*
* encrypt aname using key_s as the key schedule and key as the
* initialization vector.
*/
des_pcbc_encrypt((des_cblock *) aname, (des_cblock *) *preauth_p,
(long) (sl + 1), key_s, (des_cblock *) key, DES_ENCRYPT);
#endif
return 0;
}
void
krb_free_preauth(preauth_p, preauth_len)
char *preauth_p;
int preauth_len;
{
free(preauth_p);
return;
}
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